title: Electronic structure and relative stability of 1:1 Cu-O2 adducts from difference-dedicated configuration interaction calculations.
abstract: A computational strategy to analyze Cu-O(2) adducts based on the use of difference-dedicated configuration interaction (DDCI) calculations is presented. The electronic structure, vertical gaps and nature of the metal-O(2) interaction, and the extension of the charge transfer between both fragments have been investigated. Relative stabilities between isomers are determined from triplet states CCSD(T) calculations. The key point of the here proposed strategy rests on the use of a rationally designed active space, containing only those orbitals, which optimize the interaction pathways between LCu and O(2) fragments. The procedure has been tested on a broad set of model and synthetic biomimetic systems, the results compared with previous theoretical evaluations and/or available experimental data. Our study indicates that this strategy can be considered as an alternative approach to multireference second-order perturbation theory methods to deal with this type of systems with remarkable biradical nature.
authors.affiliation: Departament de Quimica Fisica i Inorganica, Universitat Rovira i Virgili, c/ Marcel·lí Domingo, s/n. 43007 Tarragona, Spain.
authors.forename: Jhon
authors.initials: J
authors.lastname: Zapata-Rivera
authors.forename: Rosa
authors.initials: R
authors.lastname: Caballol
authors.forename: Carmen J
authors.initials: CJ
authors.lastname: Calzado
mesh_terms: D003300:Copper / Q000737:chemistry*; D004583:Electrons; D015394:Molecular Structure; D010100:Oxygen / Q000737:chemistry*; D011789:Quantum Theory; D013237:Stereoisomerism
chemical_list: D003300:Copper; D010100:Oxygen